<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Yaml\Tests;

use PHPUnit\Framework\Attributes\DataProvider;
use PHPUnit\Framework\Attributes\RequiresPhpExtension;
use PHPUnit\Framework\TestCase;
use Symfony\Component\Yaml\Exception\ParseException;
use Symfony\Component\Yaml\Parser;
use Symfony\Component\Yaml\Tag\TaggedValue;
use Symfony\Component\Yaml\Yaml;

class ParserTest extends TestCase
{
    private ?Parser $parser;

    protected function setUp(): void
    {
        $this->parser = new Parser();
    }

    protected function tearDown(): void
    {
        $this->parser = null;

        chmod(__DIR__.'/Fixtures/not_readable.yml', 0o644);
    }

    public function testTopLevelNumber()
    {
        $yml = '5';
        $data = $this->parser->parse($yml);
        $expected = 5;
        $this->assertSameData($expected, $data);
    }

    public function testTopLevelNull()
    {
        $yml = 'null';
        $data = $this->parser->parse($yml);
        $expected = null;
        $this->assertSameData($expected, $data);
    }

    public function testEmptyValueInExpandedMappingIsSupported()
    {
        $yml = <<<'YAML'
            foo:
                bar:
                baz: qux
            YAML;

        $data = $this->parser->parse($yml);
        $expected = ['foo' => ['bar' => null, 'baz' => 'qux']];
        $this->assertSameData($expected, $data);
    }

    public function testEmptyValueInExpandedSequenceIsSupported()
    {
        $yml = <<<'YAML'
            foo:
                - bar
                -
                - baz
            YAML;

        $data = $this->parser->parse($yml);
        $expected = ['foo' => ['bar', null, 'baz']];
        $this->assertSameData($expected, $data);
    }

    public function testTaggedValueTopLevelNumber()
    {
        $yml = '!number 5';
        $data = $this->parser->parse($yml, Yaml::PARSE_CUSTOM_TAGS);
        $expected = new TaggedValue('number', 5);
        $this->assertSameData($expected, $data);
    }

    public function testTaggedValueTopLevelNull()
    {
        $yml = '!tag null';
        $data = $this->parser->parse($yml, Yaml::PARSE_CUSTOM_TAGS);

        $this->assertSameData(new TaggedValue('tag', null), $data);
    }

    public function testTaggedValueTopLevelString()
    {
        $yml = '!user barbara';
        $data = $this->parser->parse($yml, Yaml::PARSE_CUSTOM_TAGS);
        $expected = new TaggedValue('user', 'barbara');
        $this->assertSameData($expected, $data);
    }

    public function testTaggedValueTopLevelAssocInline()
    {
        $yml = '!user { name: barbara }';
        $data = $this->parser->parse($yml, Yaml::PARSE_CUSTOM_TAGS);
        $expected = new TaggedValue('user', ['name' => 'barbara']);
        $this->assertSameData($expected, $data);
    }

    public function testTaggedValueTopLevelAssoc()
    {
        $yml = <<<'YAML'
            !user
            name: barbara
            YAML;
        $data = $this->parser->parse($yml, Yaml::PARSE_CUSTOM_TAGS);
        $expected = new TaggedValue('user', ['name' => 'barbara']);
        $this->assertSameData($expected, $data);
    }

    public function testTaggedValueTopLevelList()
    {
        $yml = <<<'YAML'
            !users
            - barbara
            YAML;
        $data = $this->parser->parse($yml, Yaml::PARSE_CUSTOM_TAGS);
        $expected = new TaggedValue('users', ['barbara']);
        $this->assertSameData($expected, $data);
    }

    public function testTaggedTextAsListItem()
    {
        $yml = <<<'YAML'
            - !text |
              first line
            YAML;
        // @todo Fix the parser, eliminate this exception.
        $this->expectException(ParseException::class);
        $this->expectExceptionMessage('Unable to parse at line 2 (near "!text |").');
        $this->parser->parse($yml, Yaml::PARSE_CUSTOM_TAGS);
    }

    #[DataProvider('getDataFormSpecifications')]
    public function testSpecifications($expected, $yaml, $comment)
    {
        $this->assertEquals($expected, var_export($this->parser->parse($yaml), true), $comment);
    }

    public static function getDataFormSpecifications()
    {
        return self::loadTestsFromFixtureFiles('index.yml');
    }

    public static function getNonStringMappingKeysData()
    {
        return self::loadTestsFromFixtureFiles('nonStringKeys.yml');
    }

    #[DataProvider('invalidIndentation')]
    public function testTabsAsIndentationInYaml(string $given, string $expectedMessage)
    {
        $this->expectException(ParseException::class);
        $this->expectExceptionMessage($expectedMessage);
        $this->parser->parse($given);
    }

    public static function invalidIndentation(): array
    {
        return [
            [
                "foo:\n\tbar",
                "A YAML file cannot contain tabs as indentation at line 2 (near \"\tbar\").",
            ],
            [
                "foo:\n \tbar",
                "A YAML file cannot contain tabs as indentation at line 2 (near \"\tbar\").",
            ],
            [
                "foo:\n\t bar",
                "A YAML file cannot contain tabs as indentation at line 2 (near \"\t bar\").",
            ],
            [
                "foo:\n \t bar",
                "A YAML file cannot contain tabs as indentation at line 2 (near \"\t bar\").",
            ],
        ];
    }

    public function testParserIsStateless()
    {
        $yamlString = '# translations/messages.en.yaml

';
        $this->parser->parse($yamlString);
        $this->parser->parse($yamlString);

        $this->expectException(ParseException::class);
        $this->expectExceptionMessage("A YAML file cannot contain tabs as indentation at line 2 (near \"\tabc\")");

        $this->parser->parse("abc:\n\tabc");
    }

    #[DataProvider('validTokenSeparators')]
    public function testValidTokenSeparation(string $given, array $expected)
    {
        $actual = $this->parser->parse($given);
        $this->assertSameData($expected, $actual);
    }

    public static function validTokenSeparators(): array
    {
        return [
            [
                'foo: bar',
                ['foo' => 'bar'],
            ],
            [
                "foo:\tbar",
                ['foo' => 'bar'],
            ],
            [
                "foo: \tbar",
                ['foo' => 'bar'],
            ],
            [
                "foo:\t bar",
                ['foo' => 'bar'],
            ],
        ];
    }

    public function testEndOfTheDocumentMarker()
    {
        $yaml = <<<'EOF'
            --- %YAML:1.0
            foo
            ...
            EOF;

        $this->assertEquals('foo', $this->parser->parse($yaml));
    }

    public static function getBlockChompingTests()
    {
        $tests = [];

        $yaml = <<<'EOF'
            foo: |-
                one
                two
            bar: |-
                one
                two

            EOF;
        $expected = [
            'foo' => "one\ntwo",
            'bar' => "one\ntwo",
        ];
        $tests['Literal block chomping strip with single trailing newline'] = [$expected, $yaml];

        $yaml = <<<'EOF'
            foo: |-
                one
                two

            bar: |-
                one
                two


            EOF;
        $expected = [
            'foo' => "one\ntwo",
            'bar' => "one\ntwo",
        ];
        $tests['Literal block chomping strip with multiple trailing newlines'] = [$expected, $yaml];

        $yaml = <<<'EOF'
            {}


            EOF;
        $expected = [];
        $tests['Literal block chomping strip with multiple trailing newlines after a 1-liner'] = [$expected, $yaml];

        $yaml = <<<'EOF'
            foo: |-
                one
                two
            bar: |-
                one
                two
            EOF;
        $expected = [
            'foo' => "one\ntwo",
            'bar' => "one\ntwo",
        ];
        $tests['Literal block chomping strip without trailing newline'] = [$expected, $yaml];

        $yaml = <<<'EOF'
            foo: |
                one
                two
            bar: |
                one
                two

            EOF;
        $expected = [
            'foo' => "one\ntwo\n",
            'bar' => "one\ntwo\n",
        ];
        $tests['Literal block chomping clip with single trailing newline'] = [$expected, $yaml];

        $yaml = <<<'EOF'
            foo: |
                one
                two

            bar: |
                one
                two


            EOF;
        $expected = [
            'foo' => "one\ntwo\n",
            'bar' => "one\ntwo\n",
        ];
        $tests['Literal block chomping clip with multiple trailing newlines'] = [$expected, $yaml];

        $yaml = <<<'EOF'
            foo:
            - bar: |
                one

                two
            EOF;
        $expected = [
            'foo' => [
                [
                    'bar' => "one\n\ntwo",
                ],
            ],
        ];
        $tests['Literal block chomping clip with embedded blank line inside unindented collection'] = [$expected, $yaml];

        $yaml = <<<'EOF'
            foo: |
                one
                two
            bar: |
                one
                two
            EOF;
        $expected = [
            'foo' => "one\ntwo\n",
            'bar' => "one\ntwo",
        ];
        $tests['Literal block chomping clip without trailing newline'] = [$expected, $yaml];

        $yaml = <<<'EOF'
            foo: |+
                one
                two
            bar: |+
                one
                two

            EOF;
        $expected = [
            'foo' => "one\ntwo\n",
            'bar' => "one\ntwo\n",
        ];
        $tests['Literal block chomping keep with single trailing newline'] = [$expected, $yaml];

        $yaml = <<<'EOF'
            foo: |+
                one
                two

            bar: |+
                one
                two


            EOF;
        $expected = [
            'foo' => "one\ntwo\n\n",
            'bar' => "one\ntwo\n\n",
        ];
        $tests['Literal block chomping keep with multiple trailing newlines'] = [$expected, $yaml];

        $yaml = <<<'EOF'
            foo: |+
                one
                two
            bar: |+
                one
                two
            EOF;
        $expected = [
            'foo' => "one\ntwo\n",
            'bar' => "one\ntwo",
        ];
        $tests['Literal block chomping keep without trailing newline'] = [$expected, $yaml];

        $yaml = <<<'EOF'
            foo: >-
                one
                two
            bar: >-
                one
                two

            EOF;
        $expected = [
            'foo' => 'one two',
            'bar' => 'one two',
        ];
        $tests['Folded block chomping strip with single trailing newline'] = [$expected, $yaml];

        $yaml = <<<'EOF'
            foo: >-
                one
                two

            bar: >-
                one
                two


            EOF;
        $expected = [
            'foo' => 'one two',
            'bar' => 'one two',
        ];
        $tests['Folded block chomping strip with multiple trailing newlines'] = [$expected, $yaml];

        $yaml = <<<'EOF'
            foo: >-
                one
                two
            bar: >-
                one
                two
            EOF;
        $expected = [
            'foo' => 'one two',
            'bar' => 'one two',
        ];
        $tests['Folded block chomping strip without trailing newline'] = [$expected, $yaml];

        $yaml = <<<'EOF'
            foo: >
                one
                two
            bar: >
                one
                two

            EOF;
        $expected = [
            'foo' => "one two\n",
            'bar' => "one two\n",
        ];
        $tests['Folded block chomping clip with single trailing newline'] = [$expected, $yaml];

        $yaml = <<<'EOF'
            foo: >
                one
                two

            bar: >
                one
                two


            EOF;
        $expected = [
            'foo' => "one two\n",
            'bar' => "one two\n",
        ];
        $tests['Folded block chomping clip with multiple trailing newlines'] = [$expected, $yaml];

        $yaml = <<<'EOF'
            foo: >
                one
                two
            bar: >
                one
                two
            EOF;
        $expected = [
            'foo' => "one two\n",
            'bar' => 'one two',
        ];
        $tests['Folded block chomping clip without trailing newline'] = [$expected, $yaml];

        $yaml = <<<'EOF'
            foo: >+
                one
                two
            bar: >+
                one
                two

            EOF;
        $expected = [
            'foo' => "one two\n",
            'bar' => "one two\n",
        ];
        $tests['Folded block chomping keep with single trailing newline'] = [$expected, $yaml];

        $yaml = <<<'EOF'
            foo: >+
                one
                two

            bar: >+
                one
                two


            EOF;
        $expected = [
            'foo' => "one two\n\n",
            'bar' => "one two\n\n",
        ];
        $tests['Folded block chomping keep with multiple trailing newlines'] = [$expected, $yaml];

        $yaml = <<<'EOF'
            foo: >+
                one
                two
            bar: >+
                one
                two
            EOF;
        $expected = [
            'foo' => "one two\n",
            'bar' => 'one two',
        ];
        $tests['Folded block chomping keep without trailing newline'] = [$expected, $yaml];

        return $tests;
    }

    #[DataProvider('getBlockChompingTests')]
    public function testBlockChomping($expected, $yaml)
    {
        $this->assertSame($expected, $this->parser->parse($yaml));
    }

    /**
     * Regression test for issue #7989.
     *
     * @see https://github.com/symfony/symfony/issues/7989
     */
    public function testBlockLiteralWithLeadingNewlines()
    {
        $yaml = <<<'EOF'
            foo: |-


                bar

            EOF;
        $expected = [
            'foo' => "\n\nbar",
        ];

        $this->assertSame($expected, $this->parser->parse($yaml));
    }

    public function testObjectSupportEnabled()
    {
        $input = <<<'EOF'
            foo: !php/object O:30:"Symfony\Component\Yaml\Tests\B":1:{s:1:"b";s:3:"foo";}
            bar: 1
            EOF;
        $this->assertSameData(['foo' => new B(), 'bar' => 1], $this->parser->parse($input, Yaml::PARSE_OBJECT), '->parse() is able to parse objects');
    }

    public function testObjectSupportDisabledButNoExceptions()
    {
        $input = <<<'EOF'
            foo: !php/object O:30:"Symfony\Tests\Component\Yaml\B":1:{s:1:"b";s:3:"foo";}
            bar: 1
            EOF;
        $this->assertSameData(['foo' => null, 'bar' => 1], $this->parser->parse($input), '->parse() does not parse objects');
    }

    #[DataProvider('getObjectForMapTests')]
    public function testObjectForMap($yaml, $expected)
    {
        $flags = Yaml::PARSE_OBJECT_FOR_MAP;

        $this->assertSameData($expected, $this->parser->parse($yaml, $flags));
    }

    public static function getObjectForMapTests()
    {
        $tests = [];

        $yaml = <<<'EOF'
            foo:
                fiz: [cat]
            EOF;
        $expected = new \stdClass();
        $expected->foo = new \stdClass();
        $expected->foo->fiz = ['cat'];
        $tests['mapping'] = [$yaml, $expected];

        $yaml = '{ "foo": "bar", "fiz": "cat" }';
        $expected = new \stdClass();
        $expected->foo = 'bar';
        $expected->fiz = 'cat';
        $tests['inline-mapping'] = [$yaml, $expected];

        $yaml = "foo: bar\nbaz: foobar";
        $expected = new \stdClass();
        $expected->foo = 'bar';
        $expected->baz = 'foobar';
        $tests['object-for-map-is-applied-after-parsing'] = [$yaml, $expected];

        $yaml = <<<'EOT'
            array:
              - key: one
              - key: two
            EOT;
        $expected = new \stdClass();
        $expected->array = [];
        $expected->array[0] = new \stdClass();
        $expected->array[0]->key = 'one';
        $expected->array[1] = new \stdClass();
        $expected->array[1]->key = 'two';
        $tests['nest-map-and-sequence'] = [$yaml, $expected];

        $yaml = <<<'YAML'
            map:
              1: one
              2: two
            YAML;
        $expected = new \stdClass();
        $expected->map = new \stdClass();
        $expected->map->{1} = 'one';
        $expected->map->{2} = 'two';
        $tests['numeric-keys'] = [$yaml, $expected];

        $yaml = <<<'YAML'
            map:
              '0': one
              '1': two
            YAML;
        $expected = new \stdClass();
        $expected->map = new \stdClass();
        $expected->map->{0} = 'one';
        $expected->map->{1} = 'two';
        $tests['zero-indexed-numeric-keys'] = [$yaml, $expected];

        return $tests;
    }

    public function testObjectsSupportDisabledWithExceptions()
    {
        $yaml = <<<'EOF'
            foo: !php/object:O:30:"Symfony\Tests\Component\Yaml\B":1:{s:1:"b";s:3:"foo";}
            bar: 1
            EOF;

        $this->expectException(ParseException::class);

        $this->parser->parse($yaml, Yaml::PARSE_EXCEPTION_ON_INVALID_TYPE);
    }

    public function testMappingKeyInMultiLineStringThrowsException()
    {
        $yaml = <<<'EOF'
            data:
                dbal:wrong
                    default_connection: monolith
            EOF;

        $this->expectException(ParseException::class);
        $this->expectExceptionMessage('Mapping values are not allowed in multi-line blocks at line 2 (near "dbal:wrong").');

        $this->parser->parse($yaml);
    }

    public function testCanParseContentWithTrailingSpaces()
    {
        $yaml = "items:  \n  foo: bar";

        $expected = [
            'items' => ['foo' => 'bar'],
        ];

        $this->assertSame($expected, $this->parser->parse($yaml));
    }

    #[RequiresPhpExtension('iconv')]
    public function testNonUtf8Exception()
    {
        $yamls = [
            iconv('UTF-8', 'ISO-8859-1', "foo: 'äöüß'"),
            iconv('UTF-8', 'ISO-8859-15', "euro: '€'"),
            iconv('UTF-8', 'CP1252', "cp1252: '©ÉÇáñ'"),
        ];

        foreach ($yamls as $yaml) {
            try {
                $this->parser->parse($yaml);

                $this->fail('charsets other than UTF-8 are rejected.');
            } catch (\Exception $e) {
                $this->assertInstanceOf(ParseException::class, $e, 'charsets other than UTF-8 are rejected.');
            }
        }
    }

    public function testUnindentedCollectionException()
    {
        $yaml = <<<'EOF'

            collection:
            -item1
            -item2
            -item3

            EOF;

        $this->expectException(ParseException::class);

        $this->parser->parse($yaml);
    }

    public function testShortcutKeyUnindentedCollectionException()
    {
        $yaml = <<<'EOF'

            collection:
            -  key: foo
              foo: bar

            EOF;

        $this->expectException(ParseException::class);

        $this->parser->parse($yaml);
    }

    public function testMultipleDocumentsNotSupportedException()
    {
        $this->expectException(ParseException::class);
        $this->expectExceptionMessageMatches('/^Multiple documents are not supported.+/');
        Yaml::parse(<<<'EOL'
            # Ranking of 1998 home runs
            ---
            - Mark McGwire
            - Sammy Sosa
            - Ken Griffey

            # Team ranking
            ---
            - Chicago Cubs
            - St Louis Cardinals
            EOL
        );
    }

    public function testSequenceInAMapping()
    {
        $this->expectException(ParseException::class);
        Yaml::parse(<<<'EOF'
            yaml:
              hash: me
              - array stuff
            EOF
        );
    }

    public function testSequenceInMappingStartedBySingleDashLine()
    {
        $yaml = <<<'EOT'
            a:
            -
              b:
              -
                bar: baz
            - foo
            d: e
            EOT;
        $expected = [
            'a' => [
                [
                    'b' => [
                        [
                            'bar' => 'baz',
                        ],
                    ],
                ],
                'foo',
            ],
            'd' => 'e',
        ];

        $this->assertSame($expected, $this->parser->parse($yaml));
    }

    public function testSequenceFollowedByCommentEmbeddedInMapping()
    {
        $yaml = <<<'EOT'
            a:
                b:
                    - c
            # comment
                d: e
            EOT;
        $expected = [
            'a' => [
                'b' => ['c'],
                'd' => 'e',
            ],
        ];

        $this->assertSame($expected, $this->parser->parse($yaml));
    }

    public function testNonStringFollowedByCommentEmbeddedInMapping()
    {
        $yaml = <<<'EOT'
            a:
                b:
                    {}
            # comment
                d:
                    1.1
            # another comment
            EOT;
        $expected = [
            'a' => [
                'b' => [],
                'd' => 1.1,
            ],
        ];

        $this->assertSame($expected, $this->parser->parse($yaml));
    }

    public static function getParseExceptionNotAffectedMultiLineStringLastResortParsing()
    {
        $tests = [];

        $yaml = <<<'EOT'
            a
                b:
            EOT;
        $tests['parse error on first line'] = [$yaml];

        $yaml = <<<'EOT'
            a

            b
                c:
            EOT;
        $tests['parse error due to inconsistent indentation'] = [$yaml];

        $yaml = <<<'EOT'
             &  *  !  |  >  '  "  %  @  ` #, { asd a;sdasd }-@^qw3
            EOT;
        $tests['symfony/symfony/issues/22967#issuecomment-322067742'] = [$yaml];

        return $tests;
    }

    #[DataProvider('getParseExceptionNotAffectedMultiLineStringLastResortParsing')]
    public function testParseExceptionNotAffectedByMultiLineStringLastResortParsing($yaml)
    {
        $this->expectException(ParseException::class);
        $this->parser->parse($yaml);
    }

    public function testMultiLineStringLastResortParsing()
    {
        $yaml = <<<'EOT'
            test:
              You can have things that don't look like strings here
              true
              yes you can
            EOT;
        $expected = [
            'test' => 'You can have things that don\'t look like strings here true yes you can',
        ];

        $this->assertSame($expected, $this->parser->parse($yaml));

        $yaml = <<<'EOT'
            a:
                b
                   c
            EOT;
        $expected = [
            'a' => 'b c',
        ];

        $this->assertSame($expected, $this->parser->parse($yaml));
    }

    public function testMappingInASequence()
    {
        $this->expectException(ParseException::class);
        Yaml::parse(<<<'EOF'
            yaml:
              - array stuff
              hash: me
            EOF
        );
    }

    public function testScalarInSequence()
    {
        $this->expectException(ParseException::class);
        $this->expectExceptionMessage('missing colon');
        Yaml::parse(<<<'EOF'
            foo:
                - bar
            "missing colon"
                foo: bar
            EOF
        );
    }

    /**
     * > It is an error for two equal keys to appear in the same mapping node.
     * > In such a case the YAML processor may continue, ignoring the second
     * > "key: value" pair and issuing an appropriate warning. This strategy
     * > preserves a consistent information model for one-pass and random access
     * > applications.
     *
     * @see http://yaml.org/spec/1.2/spec.html#id2759572
     * @see http://yaml.org/spec/1.1/#id932806
     */
    public function testMappingDuplicateKeyBlock()
    {
        $input = <<<'EOD'
            parent:
                child: first
                child: duplicate
            parent:
                child: duplicate
                child: duplicate
            EOD;

        $this->expectException(ParseException::class);
        $this->expectExceptionMessage('Duplicate key "child" detected');

        Yaml::parse($input);
    }

    public function testMappingDuplicateKeyFlow()
    {
        $input = <<<'EOD'
            parent: { child: first, child: duplicate }
            parent: { child: duplicate, child: duplicate }
            EOD;

        $this->expectException(ParseException::class);
        $this->expectExceptionMessage('Duplicate key "child" detected');

        Yaml::parse($input);
    }

    #[DataProvider('getParseExceptionOnDuplicateData')]
    public function testParseExceptionOnDuplicate($input, $duplicateKey, $lineNumber)
    {
        $this->expectException(ParseException::class);
        $this->expectExceptionMessage(\sprintf('Duplicate key "%s" detected at line %d', $duplicateKey, $lineNumber));

        Yaml::parse($input);
    }

    public static function getParseExceptionOnDuplicateData()
    {
        $tests = [];

        $yaml = <<<EOD
            parent: { child: first, child: duplicate }
            EOD;
        $tests[] = [$yaml, 'child', 1];

        $yaml = <<<EOD
            parent:
              child: first,
              child: duplicate
            EOD;
        $tests[] = [$yaml, 'child', 3];

        $yaml = <<<EOD
            parent: { child: foo }
            parent: { child: bar }
            EOD;
        $tests[] = [$yaml, 'parent', 2];

        $yaml = <<<EOD
            parent: { child_mapping: { value: bar},  child_mapping: { value: bar} }
            EOD;
        $tests[] = [$yaml, 'child_mapping', 1];

        $yaml = <<<EOD
            parent:
              child_mapping:
                value: bar
              child_mapping:
                value: bar
            EOD;
        $tests[] = [$yaml, 'child_mapping', 4];

        $yaml = <<<EOD
            parent: { child_sequence: ['key1', 'key2', 'key3'],  child_sequence: ['key1', 'key2', 'key3'] }
            EOD;
        $tests[] = [$yaml, 'child_sequence', 1];

        $yaml = <<<EOD
            parent:
              child_sequence:
                - key1
                - key2
                - key3
              child_sequence:
                - key1
                - key2
                - key3
            EOD;
        $tests[] = [$yaml, 'child_sequence', 6];

        return $tests;
    }

    public function testNullAsDuplicatedData()
    {
        $this->expectException(ParseException::class);

        $yaml = <<<EOD
            parent:
              child:
              child2:
              child:
            EOD;

        Yaml::parse($yaml);
    }

    public function testEmptyValue()
    {
        $input = <<<'EOF'
            hash:
            EOF;

        $this->assertSame(['hash' => null], Yaml::parse($input));
    }

    public function testCommentAtTheRootIndent()
    {
        $this->assertSame([
            'services' => [
                'app.foo_service' => [
                    'class' => 'Foo',
                ],
                'app/bar_service' => [
                    'class' => 'Bar',
                ],
            ],
        ], Yaml::parse(<<<'EOF'
            # comment 1
            services:
            # comment 2
                # comment 3
                app.foo_service:
                    class: Foo
            # comment 4
                # comment 5
                app/bar_service:
                    class: Bar
            EOF
        ));
    }

    public function testStringBlockWithComments()
    {
        $this->assertSame(['content' => <<<'EOT'
            # comment 1
            header

                # comment 2
                <body>
                    <h1>title</h1>
                </body>

            footer # comment3
            EOT
        ], Yaml::parse(<<<'EOF'
            content: |
                # comment 1
                header

                    # comment 2
                    <body>
                        <h1>title</h1>
                    </body>

                footer # comment3
            EOF
        ));
    }

    public function testFoldedStringBlockWithComments()
    {
        $this->assertSame([['content' => <<<'EOT'
            # comment 1
            header

                # comment 2
                <body>
                    <h1>title</h1>
                </body>

            footer # comment3
            EOT
        ]], Yaml::parse(<<<'EOF'
            -
                content: |
                    # comment 1
                    header

                        # comment 2
                        <body>
                            <h1>title</h1>
                        </body>

                    footer # comment3
            EOF
        ));
    }

    public function testNestedFoldedStringBlockWithComments()
    {
        $this->assertSame([[
            'title' => 'some title',
            'content' => <<<'EOT'
                # comment 1
                header

                    # comment 2
                    <body>
                        <h1>title</h1>
                    </body>

                footer # comment3
                EOT,
        ]], Yaml::parse(<<<'EOF'
            -
                title: some title
                content: |
                    # comment 1
                    header

                        # comment 2
                        <body>
                            <h1>title</h1>
                        </body>

                    footer # comment3
            EOF
        ));
    }

    public function testReferenceResolvingInInlineStrings()
    {
        $this->assertSame([
            'var' => 'var-value',
            'scalar' => 'var-value',
            'list' => ['var-value'],
            'list_in_list' => [['var-value']],
            'map_in_list' => [['key' => 'var-value']],
            'embedded_mapping' => [['key' => 'var-value']],
            'map' => ['key' => 'var-value'],
            'list_in_map' => ['key' => ['var-value']],
            'map_in_map' => ['foo' => ['bar' => 'var-value']],
            'foo' => ['bar' => 'baz'],
            'bar' => ['foo' => 'baz'],
            'baz' => ['foo'],
            'foobar' => ['foo'],
        ], Yaml::parse(<<<'EOF'
            var:  &var var-value
            scalar: *var
            list: [ *var ]
            list_in_list: [[ *var ]]
            map_in_list: [ { key: *var } ]
            embedded_mapping: [ key: *var ]
            map: { key: *var }
            list_in_map: { key: [*var] }
            map_in_map: { foo: { bar: *var } }
            foo: { bar: &baz baz }
            bar: { foo: *baz }
            baz: [ &foo foo ]
            foobar: [ *foo ]
            EOF
        ));
    }

    public function testYamlDirective()
    {
        $yaml = <<<'EOF'
            %YAML 1.2
            ---
            foo: 1
            bar: 2
            EOF;
        $this->assertSame(['foo' => 1, 'bar' => 2], $this->parser->parse($yaml));
    }

    public function testFloatKeys()
    {
        $yaml = <<<'EOF'
            foo:
                1.2: "bar"
                1.3: "baz"
            EOF;

        $this->expectException(ParseException::class);
        $this->expectExceptionMessage('Numeric keys are not supported. Quote your evaluable mapping keys instead');

        $this->parser->parse($yaml);
    }

    public function testBooleanKeys()
    {
        $yaml = <<<'EOF'
            true: foo
            false: bar
            EOF;

        $this->expectException(ParseException::class);
        $this->expectExceptionMessage('Non-string keys are not supported. Quote your evaluable mapping keys instead');

        $this->parser->parse($yaml);
    }

    public function testExplicitStringCasting()
    {
        $yaml = <<<'EOF'
            '1.2': "bar"
            !!str 1.3: "baz"

            'true': foo
            !!str false: bar

            !!str null: 'null'
            '~': 'null'
            EOF;

        $expected = [
            '1.2' => 'bar',
            '1.3' => 'baz',
            'true' => 'foo',
            'false' => 'bar',
            'null' => 'null',
            '~' => 'null',
        ];

        $this->assertSame($expected, $this->parser->parse($yaml));
    }

    public function testColonInMappingValueException()
    {
        $yaml = <<<'EOF'
            foo: bar: baz
            EOF;

        $this->expectException(ParseException::class);
        $this->expectExceptionMessage('A colon cannot be used in an unquoted mapping value');

        $this->parser->parse($yaml);
    }

    public function testColonInMappingValueExceptionNotTriggeredByColonInComment()
    {
        $yaml = <<<'EOT'
            foo:
                bar: foobar # Note: a comment after a colon
            EOT;

        $this->assertSame(['foo' => ['bar' => 'foobar']], $this->parser->parse($yaml));
    }

    #[DataProvider('getCommentLikeStringInScalarBlockData')]
    public function testCommentLikeStringsAreNotStrippedInBlockScalars($yaml, $expectedParserResult)
    {
        $this->assertSame($expectedParserResult, $this->parser->parse($yaml));
    }

    public static function getCommentLikeStringInScalarBlockData()
    {
        $tests = [];

        $yaml = <<<'EOT'
            pages:
                -
                    title: some title
                    content: |
                        # comment 1
                        header

                            # comment 2
                            <body>
                                <h1>title</h1>
                            </body>

                        footer # comment3
            EOT;
        $expected = [
            'pages' => [
                [
                    'title' => 'some title',
                    'content' => <<<'EOT'
                        # comment 1
                        header

                            # comment 2
                            <body>
                                <h1>title</h1>
                            </body>

                        footer # comment3
                        EOT,
                ],
            ],
        ];
        $tests[] = [$yaml, $expected];

        $yaml = <<<'EOT'
            test: |
                foo
                # bar
                baz
            collection:
                - one: |
                    foo
                    # bar
                    baz
                - two: |
                    foo
                    # bar
                    baz
            EOT;
        $expected = [
            'test' => <<<'EOT'
                foo
                # bar
                baz

                EOT,
            'collection' => [
                [
                    'one' => <<<'EOT'
                        foo
                        # bar
                        baz

                        EOT,
                ],
                [
                    'two' => <<<'EOT'
                        foo
                        # bar
                        baz
                        EOT,
                ],
            ],
        ];
        $tests[] = [$yaml, $expected];

        $yaml = <<<'EOT'
            foo:
              bar:
                scalar-block: >
                  line1
                  line2>
              baz:
            # comment
                foobar: ~
            EOT;
        $expected = [
            'foo' => [
                'bar' => [
                    'scalar-block' => "line1 line2>\n",
                ],
                'baz' => [
                    'foobar' => null,
                ],
            ],
        ];
        $tests[] = [$yaml, $expected];

        $yaml = <<<'EOT'
            a:
                b: hello
            #    c: |
            #        first row
            #        second row
                d: hello
            EOT;
        $expected = [
            'a' => [
                'b' => 'hello',
                'd' => 'hello',
            ],
        ];
        $tests[] = [$yaml, $expected];

        return $tests;
    }

    public function testBlankLinesAreParsedAsNewLinesInFoldedBlocks()
    {
        $yaml = <<<'EOT'
            test: >
                <h2>A heading</h2>

                <ul>
                <li>a list</li>
                <li>may be a good example</li>
                </ul>
            EOT;

        $this->assertSame(
            [
                'test' => <<<'EOT'
                    <h2>A heading</h2>
                    <ul> <li>a list</li> <li>may be a good example</li> </ul>
                    EOT,
            ],
            $this->parser->parse($yaml)
        );
    }

    public function testAdditionallyIndentedLinesAreParsedAsNewLinesInFoldedBlocks()
    {
        $yaml = <<<'EOT'
            test: >
                <h2>A heading</h2>

                <ul>
                  <li>a list</li>
                  <li>may be a good example</li>
                </ul>
            EOT;

        $this->assertSame(
            [
                'test' => <<<'EOT'
                    <h2>A heading</h2>
                    <ul>
                      <li>a list</li>
                      <li>may be a good example</li>
                    </ul>
                    EOT,
            ],
            $this->parser->parse($yaml)
        );
    }

    #[DataProvider('getBinaryData')]
    public function testParseBinaryData($data)
    {
        $this->assertSame(['data' => 'Hello world'], $this->parser->parse($data));
    }

    public static function getBinaryData()
    {
        return [
            'enclosed with double quotes' => ['data: !!binary "SGVsbG8gd29ybGQ="'],
            'enclosed with single quotes' => ["data: !!binary 'SGVsbG8gd29ybGQ='"],
            'containing spaces' => ['data: !!binary  "SGVs bG8gd 29ybGQ="'],
            'in block scalar' => [
                <<<'EOT'
                    data: !!binary |
                        SGVsbG8gd29ybGQ=
                    EOT,
            ],
            'containing spaces in block scalar' => [
                <<<'EOT'
                    data: !!binary |
                        SGVs bG8gd 29ybGQ=
                    EOT,
            ],
        ];
    }

    #[DataProvider('getInvalidBinaryData')]
    public function testParseInvalidBinaryData($data, $expectedMessage)
    {
        $this->expectException(ParseException::class);
        $this->expectExceptionMessageMatches($expectedMessage);

        $this->parser->parse($data);
    }

    public static function getInvalidBinaryData()
    {
        return [
            'length not a multiple of four' => ['data: !!binary "SGVsbG8d29ybGQ="', '/The normalized base64 encoded data \(data without whitespace characters\) length must be a multiple of four \(\d+ bytes given\)/'],
            'invalid characters' => ['!!binary "SGVsbG8#d29ybGQ="', '/The base64 encoded data \(.*\) contains invalid characters/'],
            'too many equals characters' => ['data: !!binary "SGVsbG8gd29yb==="', '/The base64 encoded data \(.*\) contains invalid characters/'],
            'misplaced equals character' => ['data: !!binary "SGVsbG8gd29ybG=Q"', '/The base64 encoded data \(.*\) contains invalid characters/'],
            'length not a multiple of four in block scalar' => [
                <<<'EOT'
                    data: !!binary |
                        SGVsbG8d29ybGQ=
                    EOT,
                '/The normalized base64 encoded data \(data without whitespace characters\) length must be a multiple of four \(\d+ bytes given\)/',
            ],
            'invalid characters in block scalar' => [
                <<<'EOT'
                    data: !!binary |
                        SGVsbG8#d29ybGQ=
                    EOT,
                '/The base64 encoded data \(.*\) contains invalid characters/',
            ],
            'too many equals characters in block scalar' => [
                <<<'EOT'
                    data: !!binary |
                        SGVsbG8gd29yb===
                    EOT,
                '/The base64 encoded data \(.*\) contains invalid characters/',
            ],
            'misplaced equals character in block scalar' => [
                <<<'EOT'
                    data: !!binary |
                        SGVsbG8gd29ybG=Q
                    EOT,
                '/The base64 encoded data \(.*\) contains invalid characters/',
            ],
        ];
    }

    public function testParseDateWithSubseconds()
    {
        $yaml = <<<'EOT'
            date: 2002-12-14T01:23:45.670000Z
            EOT;

        $this->assertSameData(['date' => 1039829025.67], $this->parser->parse($yaml));
    }

    public function testParseDateAsMappingValue()
    {
        $yaml = <<<'EOT'
            date: 2002-12-14
            EOT;
        $expectedDate = (new \DateTimeImmutable())
            ->setTimeZone(new \DateTimeZone('UTC'))
            ->setDate(2002, 12, 14)
            ->setTime(0, 0, 0);

        $this->assertSameData(['date' => $expectedDate], $this->parser->parse($yaml, Yaml::PARSE_DATETIME));
    }

    #[DataProvider('parserThrowsExceptionWithCorrectLineNumberProvider')]
    public function testParserThrowsExceptionWithCorrectLineNumber($lineNumber, $yaml)
    {
        $this->expectException(ParseException::class);
        $this->expectExceptionMessage(\sprintf('Unexpected characters near "," at line %d (near "bar: "123",").', $lineNumber));

        $this->parser->parse($yaml);
    }

    public static function parserThrowsExceptionWithCorrectLineNumberProvider()
    {
        return [
            [
                4,
                <<<'YAML'
                    foo:
                        -
                            # bar
                            bar: "123",
                    YAML,
            ],
            [
                5,
                <<<'YAML'
                    foo:
                        -
                            # bar
                            # bar
                            bar: "123",
                    YAML,
            ],
            [
                8,
                <<<'YAML'
                    foo:
                        -
                            # foobar
                            baz: 123
                    bar:
                        -
                            # bar
                            bar: "123",
                    YAML,
            ],
            [
                10,
                <<<'YAML'
                    foo:
                        -
                            # foobar
                            # foobar
                            baz: 123
                    bar:
                        -
                            # bar
                            # bar
                            bar: "123",
                    YAML,
            ],
        ];
    }

    public function testParseMultiLineQuotedString()
    {
        $yaml = <<<EOT
            foo: "bar
              baz
               foobar
            foo"
            bar: baz
            EOT;

        $this->assertSame(['foo' => 'bar baz foobar foo', 'bar' => 'baz'], $this->parser->parse($yaml));
    }

    public function testMultiLineQuotedStringWithTrailingBackslash()
    {
        $yaml = <<<YAML
            foobar:
                "foo\
                bar"
            YAML;

        $this->assertSame(['foobar' => 'foobar'], $this->parser->parse($yaml));
    }

    public function testCommentCharactersInMultiLineQuotedStrings()
    {
        $yaml = <<<YAML
            foo:
                foobar: 'foo
                  #bar'
                bar: baz
            YAML;
        $expected = [
            'foo' => [
                'foobar' => 'foo #bar',
                'bar' => 'baz',
            ],
        ];

        $this->assertSame($expected, $this->parser->parse($yaml));
    }

    public function testBlankLinesInQuotedMultiLineString()
    {
        $yaml = <<<YAML
            foobar: 'foo

                bar'
            YAML;
        $expected = [
            'foobar' => "foo\nbar",
        ];

        $this->assertSame($expected, $this->parser->parse($yaml));
    }

    public function testEscapedQuoteInQuotedMultiLineString()
    {
        $yaml = <<<YAML
            foobar: "foo
                \\"bar\\"
                baz"
            YAML;
        $expected = [
            'foobar' => 'foo "bar" baz',
        ];

        $this->assertSame($expected, $this->parser->parse($yaml));
    }

    public function testBackslashInQuotedMultiLineString()
    {
        $yaml = <<<YAML
            foobar: "foo
                bar\\\\"
            YAML;
        $expected = [
            'foobar' => 'foo bar\\',
        ];

        $this->assertSame($expected, $this->parser->parse($yaml));
    }

    #[DataProvider('wrappedUnquotedStringsProvider')]
    public function testWrappedUnquotedStringWithMultipleSpacesInValue(string $yaml, array $expected)
    {
        $this->assertSame($expected, $this->parser->parse($yaml));
    }

    public static function wrappedUnquotedStringsProvider()
    {
        return [
            'mapping' => [
                '{ foo: bar  bar, fiz: cat      cat }',
                [
                    'foo' => 'bar  bar',
                    'fiz' => 'cat      cat',
                ],
            ],
            'sequence' => [
                '[ bar  bar, cat      cat ]',
                [
                    'bar  bar',
                    'cat      cat',
                ],
            ],
        ];
    }

    public function testParseMultiLineUnquotedString()
    {
        $yaml = <<<EOT
            foo: bar
              baz
               foobar
              foo
            bar: baz
            EOT;

        $this->assertSame(['foo' => 'bar baz foobar foo', 'bar' => 'baz'], $this->parser->parse($yaml));
    }

    #[DataProvider('getUnquotedMultilineScalarHandlesCommentsAndBlanksData')]
    public function testUnquotedMultilineScalarHandlesCommentsAndBlanks(string $yaml, array $expected)
    {
        $this->assertSame($expected, $this->parser->parse($yaml));
    }

    public static function getUnquotedMultilineScalarHandlesCommentsAndBlanksData()
    {
        yield 'comments interspersed stops scalar' => [
            <<<YAML
                key: unquoted
                  # this comment terminates
                another_key: works
                YAML,
            [
                'key' => 'unquoted',
                'another_key' => 'works',
            ],
        ];

        yield 'only comments' => [
            <<<YAML
                key: unquoted
                  # this comment should be ignored
                  # another comment
                another_key: works
                YAML,
            [
                'key' => 'unquoted',
                'another_key' => 'works',
            ],
        ];

        yield 'blank lines are preserved and comment stops scalar' => [
            <<<YAML
                key: unquoted
                  next line

                  # this comment terminates the scalar
                another_key: works
                YAML,
            [
                'key' => 'unquoted next line',
                'another_key' => 'works',
            ],
        ];

        yield 'comment at end' => [
            <<<YAML
                key: unquoted
                  next line
                  # comment at end
                another_key: works
                YAML,
            [
                'key' => 'unquoted next line',
                'another_key' => 'works',
            ],
        ];
    }

    public function testUnquotedMultilineScalarThrowsOnOrphanedLineAfterComment()
    {
        $this->expectException(ParseException::class);
        $this->expectExceptionMessage('Unable to parse at line 3 (near "  next line")');

        $yaml = <<<YAML
            key: unquoted
              # this comment terminates
              next line
            another_key: works
            YAML;

        $this->parser->parse($yaml);
    }

    public function testUnquotedMultilineScalarWithBlankLines()
    {
        $yaml = <<<YAML
            foo:
              line 1

              line 2
            YAML;
        $this->assertSame(['foo' => "line 1\nline 2"], $this->parser->parse($yaml));
    }

    #[DataProvider('provideInvalidYamlFiles')]
    public function testLineNumberInException(int $expectedLine, string $yaml, string $message)
    {
        $this->expectException(ParseException::class);
        $this->expectExceptionMessage($message);
        $this->expectExceptionMessage(\sprintf('at line %d', $expectedLine));

        $this->parser->parse($yaml);
    }

    public static function provideInvalidYamlFiles(): iterable
    {
        yield 'invalid_nested_under_scalar' => [
            4,
            <<<YAML
                en:
                  NONAMESPACE: Include Entity without Namespace
                  Invalid: Foo
                    About: 'About us'
                    - Invalid
                YAML,
            'Unable to parse',
        ];

        yield 'invalid_nested_under_scalar_with_trailing_newlines' => [
            4,
            <<<YAML
                en:
                  NONAMESPACE: Include Entity without Namespace
                  Invalid: Foo
                    About: 'About us'
                    - Invalid


                YAML,
            'Unable to parse',
        ];

        yield 'colon_in_unquoted_value' => [
            2,
            <<<YAML
                foo: bar
                  baz: qux
                YAML,
            'A colon cannot be used in an unquoted mapping value',
        ];

        yield 'colon_in_unquoted_value_multiline' => [
            2,
            <<<YAML
                foo:
                  bar
                  baz: qux
                YAML,
            'Mapping values are not allowed in multi-line blocks',
        ];
    }

    #[DataProvider('unquotedStringWithTrailingComment')]
    public function testParseMultiLineUnquotedStringWithTrailingComment(string $yaml, array $expected)
    {
        $this->assertSame($expected, $this->parser->parse($yaml));
    }

    public static function unquotedStringWithTrailingComment()
    {
        return [
            'comment after comma' => [
                <<<'YAML'
                    {
                        foo: 3, # comment
                        bar: 3
                    }
                    YAML,
                ['foo' => 3, 'bar' => 3],
            ],
            'comment after space' => [
                <<<'YAML'
                    {
                        foo: 3 # comment
                    }
                    YAML,
                ['foo' => 3],
            ],
            'comment after space, but missing space after #' => [
                <<<'YAML'
                    {
                        foo: 3 #comment
                    }
                    YAML,
                ['foo' => 3],
            ],
            'comment after tab' => [
                <<<YAML
                    {
                        foo: 3\t# comment
                    }
                    YAML,
                ['foo' => 3],
            ],
            'comment after tab, but missing space after #' => [
                <<<YAML
                    {
                        foo: 3\t#comment
                    }
                    YAML,
                ['foo' => 3],
            ],
            '# in mapping value' => [
                <<<'YAML'
                    {
                        foo: example.com/#about
                    }
                    YAML,
                ['foo' => 'example.com/#about'],
            ],
        ];
    }

    #[DataProvider('escapedQuotationCharactersInQuotedStrings')]
    public function testParseQuotedStringContainingEscapedQuotationCharacters(string $yaml, array $expected)
    {
        $this->assertSame($expected, $this->parser->parse($yaml));
    }

    public static function escapedQuotationCharactersInQuotedStrings()
    {
        return [
            'single quoted string' => [
                <<<YAML
                    entries:
                     - message: 'No emails received before timeout - Address: ''test@testemail.company.com''
                           Keyword: ''Your Order confirmation'' ttl: 50'
                       outcome: failed
                    YAML,
                [
                    'entries' => [
                        [
                            'message' => 'No emails received before timeout - Address: \'test@testemail.company.com\' Keyword: \'Your Order confirmation\' ttl: 50',
                            'outcome' => 'failed',
                        ],
                    ],
                ],
            ],
            'double quoted string' => [
                <<<YAML
                    entries:
                     - message: "No emails received before timeout - Address: \"test@testemail.company.com\"
                           Keyword: \"Your Order confirmation\" ttl: 50"
                       outcome: failed
                    YAML,
                [
                    'entries' => [
                        [
                            'message' => 'No emails received before timeout - Address: "test@testemail.company.com" Keyword: "Your Order confirmation" ttl: 50',
                            'outcome' => 'failed',
                        ],
                    ],
                ],
            ],
        ];
    }

    public function testBackslashInSingleQuotedString()
    {
        $this->assertSame(['foo' => 'bar\\'], $this->parser->parse("foo: 'bar\'"));
    }

    public function testParseMultiLineString()
    {
        $this->assertSame("foo bar\nbaz", $this->parser->parse("foo\nbar\n\nbaz"));
    }

    #[DataProvider('multiLineDataProvider')]
    public function testParseMultiLineMappingValue($yaml, $expected, $parseError)
    {
        $this->assertSame($expected, $this->parser->parse($yaml));
    }

    public static function multiLineDataProvider()
    {
        $tests = [];

        $yaml = <<<'EOF'
            foo:
            - bar:
                one

                two
                three
            EOF;
        $expected = [
            'foo' => [
                [
                    'bar' => "one\ntwo three",
                ],
            ],
        ];

        $tests[] = [$yaml, $expected, false];

        $yaml = <<<'EOF'
            bar
            "foo"
            EOF;
        $expected = 'bar "foo"';

        $tests[] = [$yaml, $expected, false];

        $yaml = <<<'EOF'
            bar
            "foo
            EOF;
        $expected = 'bar "foo';

        $tests[] = [$yaml, $expected, false];

        $yaml = <<<'EOF'
            bar

            'foo'
            EOF;
        $expected = "bar\n'foo'";

        $tests[] = [$yaml, $expected, false];

        $yaml = <<<'EOF'
            bar

            foo'
            EOF;
        $expected = "bar\nfoo'";

        $tests[] = [$yaml, $expected, false];

        return $tests;
    }

    #[DataProvider('inlineNotationSpanningMultipleLinesProvider')]
    public function testInlineNotationSpanningMultipleLines($expected, string $yaml)
    {
        $this->assertSame($expected, $this->parser->parse($yaml));
    }

    public static function inlineNotationSpanningMultipleLinesProvider(): array
    {
        return [
            'mapping' => [
                ['foo' => 'bar', 'bar' => 'baz'],
                <<<YAML
                    {
                        'foo': 'bar',
                        'bar': 'baz'
                    }
                    YAML,
            ],
            'mapping with unquoted strings and values' => [
                ['foo' => 'bar', 'bar' => 'baz'],
                <<<YAML
                    {
                        foo: bar,
                        bar: baz
                    }
                    YAML,
            ],
            'sequence' => [
                ['foo', 'bar'],
                <<<YAML
                    [
                        'foo',
                        'bar'
                    ]
                    YAML,
            ],
            'sequence with unquoted items' => [
                ['foo', 'bar'],
                <<<YAML
                    [
                        foo,
                        bar
                    ]
                    YAML,
            ],
            'nested mapping terminating at end of line' => [
                [
                    'foo' => [
                        'bar' => 'foobar',
                    ],
                ],
                <<<YAML
                    { foo: { bar: foobar }
                    }
                    YAML,
            ],
            'nested sequence terminating at end of line' => [
                [
                    'foo',
                    [
                        'bar',
                        'baz',
                    ],
                ],
                <<<YAML
                    [ foo, [bar, baz]
                    ]
                    YAML,
            ],
            'nested sequence spanning multiple lines' => [
                [
                    ['entry1', []],
                    ['entry2'],
                ],
                <<<YAML
                    [
                        ['entry1', {}],
                        ['entry2']
                    ]
                    YAML,
            ],
            'sequence nested in mapping' => [
                ['foo' => ['bar', 'foobar'], 'bar' => ['baz']],
                <<<YAML
                    {
                        'foo': ['bar', 'foobar'],
                        'bar': ['baz']
                    }
                    YAML,
            ],
            'sequence spanning multiple lines nested in mapping' => [
                [
                    'foobar' => [
                        'foo',
                        'bar',
                        'baz',
                    ],
                ],
                <<<YAML
                    foobar: [foo,
                        bar,
                        baz
                    ]
                    YAML,
            ],
            'sequence spanning multiple lines nested in mapping with a following mapping' => [
                [
                    'foobar' => [
                        'foo',
                        'bar',
                    ],
                    'bar' => 'baz',
                ],
                <<<YAML
                    foobar: [
                        foo,
                        bar,
                    ]
                    bar: baz
                    YAML,
            ],
            'nested sequence nested in mapping starting on the same line' => [
                [
                    'foo' => [
                        'foobar',
                        [
                            'bar',
                            'baz',
                        ],
                    ],
                ],
                <<<YAML
                    foo: [foobar, [
                        bar,
                        baz
                    ]]
                    YAML,
            ],
            'nested sequence nested in mapping starting on the following line' => [
                [
                    'foo' => [
                        'foobar',
                        [
                            'bar',
                            'baz',
                        ],
                    ],
                ],
                <<<YAML
                    foo: [foobar,
                        [
                            bar,
                            baz
                    ]]
                    YAML,
            ],
            'mapping nested in sequence' => [
                ['foo', ['bar' => 'baz']],
                <<<YAML
                    [
                        'foo',
                        {
                            'bar': 'baz'
                        }
                    ]
                    YAML,
            ],
            'mapping spanning multiple lines nested in sequence' => [
                [
                    [
                        'foo' => 'bar',
                        'bar' => 'baz',
                    ],
                ],
                <<<YAML
                    - {
                        foo: bar,
                        bar: baz
                    }
                    YAML,
            ],
            'nested mapping nested in sequence starting on the same line' => [
                [
                    [
                        'foo' => [
                            'bar' => 'foobar',
                        ],
                        'bar' => 'baz',
                    ],
                ],
                <<<YAML
                    - { foo: {
                            bar: foobar
                        },
                        bar: baz
                    }
                    YAML,
            ],
            'nested mapping nested in sequence starting on the following line' => [
                [
                    [
                        'foo' => [
                            'bar' => 'foobar',
                        ],
                        'bar' => 'baz',
                    ],
                ],
                <<<YAML
                    - { foo:
                        {
                            bar: foobar
                        },
                        bar: baz
                    }
                    YAML,
            ],
            'single quoted multi-line string' => [
                "foo\nbar",
                <<<YAML
                    'foo

                    bar'
                    YAML,
            ],
            'double quoted multi-line string' => [
                "foo\nbar",
                <<<YAML
                    'foo

                    bar'
                    YAML,
            ],
            'single-quoted multi-line mapping value' => [
                ['foo' => "bar\nbaz"],
                <<<YAML
                    foo: 'bar

                    baz'
                    YAML,
            ],
            'mixed mapping with inline notation having separated lines' => [
                [
                    'map' => [
                        'key' => 'value',
                        'a' => 'b',
                    ],
                    'param' => 'some',
                ],
                <<<YAML
                    map: {
                        key: "value",
                        a: "b"
                    }
                    param: "some"
                    YAML,
            ],
            'mixed mapping with inline notation on one line' => [
                [
                    'map' => [
                        'key' => 'value',
                        'a' => 'b',
                    ],
                    'param' => 'some',
                ],
                <<<YAML
                    map: {key: "value", a: "b"}
                    param: "some"
                    YAML,
            ],
            'mixed mapping with inline notation on one line with a comment' => [
                [
                    'map' => [
                        'key' => 'value',
                        'a' => 'b',
                    ],
                    'param' => 'some',
                ],
                <<<YAML
                    map: {key: "value", a: "b"} # comment
                    param: "some"
                    YAML,
            ],
            'mixed mapping with compact inline notation on one line' => [
                [
                    'map' => [
                        'key' => 'value',
                        'a' => 'b',
                    ],
                    'param' => 'some',
                ],
                <<<YAML
                    map: {key: "value",
                    a: "b"}
                    param: "some"
                    YAML,
            ],
            'nested collections containing strings with bracket chars' => [
                [
                    [']'],
                    ['}'],
                    ['ba[r'],
                    ['[ba]r'],
                    ['bar]'],
                    ['foo' => 'bar{'],
                    ['foo' => 'b{ar}'],
                    ['foo' => 'bar}'],
                ],
                <<<YAML
                    [
                        [
                            "]"
                        ],
                        [
                            "}"
                        ],
                        [
                            "ba[r"
                        ],
                        [
                            '[ba]r'
                        ],
                        [
                            "bar]"
                        ],
                        {
                            foo: "bar{"
                        },
                        {
                            foo: "b{ar}"
                        },
                        {
                            foo: 'bar}'
                        }
                    ]
                    YAML,
            ],
            'escaped characters in quoted strings' => [
                [
                    ['te"st'],
                    ['test'],
                    ["te'st"],
                    ['te"st]'],
                    ['te"st'],
                    ['test'],
                    ["te'st"],
                    ['te"st]'],
                ],
                <<<YAML
                    [
                        ["te\"st"],["test"],['te''st'],["te\"st]"],
                        ["te\"st"],
                        ["test"],
                        ['te''st'],
                        ["te\"st]"]
                    ]
                    YAML,
            ],
        ];
    }

    public function testRootLevelInlineMappingFollowedByMoreContentIsInvalid()
    {
        $this->expectException(ParseException::class);
        $this->expectExceptionMessage('Unable to parse at line 2 (near "foobar").');

        $yaml = <<<YAML
            { foo: bar }
            foobar
            YAML;

        $this->parser->parse($yaml);
    }

    public function testInlineMappingFollowedByMoreContentIsInvalid()
    {
        $this->expectException(ParseException::class);
        $this->expectExceptionMessage('Unexpected token "baz" at line 1 (near "{ foo: bar } baz").');

        $yaml = <<<YAML
            { foo: bar } baz
            YAML;

        $this->parser->parse($yaml);
    }

    public function testInlineSequenceFollowedByMoreContentIsInvalid()
    {
        $this->expectException(ParseException::class);
        $this->expectExceptionMessage('Unexpected token ",bar," at line 1 (near "[\'foo\'],bar,").');

        $yaml = <<<YAML
            ['foo'],bar,
            YAML;

        $this->parser->parse($yaml);
    }

    public function testTaggedInlineMapping()
    {
        $this->assertSameData(new TaggedValue('foo', ['foo' => 'bar']), $this->parser->parse('!foo {foo: bar}', Yaml::PARSE_CUSTOM_TAGS));
    }

    public function testInvalidInlineSequenceContainingStringWithEscapedQuotationCharacter()
    {
        $this->expectException(ParseException::class);

        $this->parser->parse('["\\"]');
    }

    #[DataProvider('taggedValuesProvider')]
    public function testCustomTagSupport($expected, $yaml)
    {
        $this->assertSameData($expected, $this->parser->parse($yaml, Yaml::PARSE_CUSTOM_TAGS));
    }

    public static function taggedValuesProvider()
    {
        return [
            'scalars' => [
                [
                    'foo' => new TaggedValue('inline', 'bar'),
                    'quz' => new TaggedValue('long', 'this is a long text'),
                ],
                <<<YAML
                    foo: !inline bar
                    quz: !long >
                      this is a long
                      text
                    YAML,
            ],
            'sequences' => [
                [new TaggedValue('foo', ['yaml']), new TaggedValue('quz', ['bar'])],
                <<<YAML
                    - !foo
                        - yaml
                    - !quz [bar]
                    YAML,
            ],
            'mappings' => [
                new TaggedValue('foo', ['foo' => new TaggedValue('quz', ['bar']), 'quz' => new TaggedValue('foo', ['quz' => 'bar'])]),
                <<<YAML
                    !foo
                    foo: !quz [bar]
                    quz: !foo
                       quz: bar
                    YAML,
            ],
            'inline' => [
                [new TaggedValue('foo', ['foo', 'bar']), new TaggedValue('quz', ['foo' => 'bar', 'quz' => new TaggedValue('bar', ['one' => 'bar'])])],
                <<<YAML
                    - !foo [foo, bar]
                    - !quz {foo: bar, quz: !bar {one: bar}}
                    YAML,
            ],
            'spaces-around-tag-value-in-sequence' => [
                [new TaggedValue('foo', 'bar')],
                '[ !foo bar ]',
            ],
            'with-comments' => [
                [
                    [new TaggedValue('foo', ['foo', 'baz'])],
                ],
                <<<YAML
                    - [!foo [
                        foo,
                        baz
                        #bar
                      ]]
                    YAML,
            ],
            'with-comments-trailing-comma' => [
                [
                    [new TaggedValue('foo', ['foo', 'baz'])],
                ],
                <<<YAML
                    - [!foo [
                        foo,
                        baz,
                        #bar
                      ]]
                    YAML,
            ],
        ];
    }

    public function testNonSpecificTagSupport()
    {
        $this->assertSame(12, $this->parser->parse('! 12'));
    }

    public function testCustomTagsDisabled()
    {
        $this->expectException(ParseException::class);
        $this->expectExceptionMessage('Tags support is not enabled. Enable the "Yaml::PARSE_CUSTOM_TAGS" flag to use "!iterator" at line 1 (near "!iterator [foo]").');
        $this->parser->parse('!iterator [foo]');
    }

    public function testUnsupportedTagWithScalar()
    {
        $this->expectException(ParseException::class);
        $this->expectExceptionMessage('Tags support is not enabled. Enable the "Yaml::PARSE_CUSTOM_TAGS" flag to use "!iterator" at line 1 (near "!iterator foo").');
        $this->parser->parse('!iterator foo');
    }

    public function testUnsupportedBuiltInTagWithScalar()
    {
        $this->expectException(ParseException::class);
        $this->expectExceptionMessage('The string "!!iterator foo" could not be parsed as it uses an unsupported built-in tag at line 1 (near "!!iterator foo").');
        $this->parser->parse('!!iterator foo');
    }

    public function testExceptionWhenUsingUnsupportedBuiltInTags()
    {
        $this->expectException(ParseException::class);
        $this->expectExceptionMessage('The built-in tag "!!foo" is not implemented at line 1 (near "!!foo").');
        $this->parser->parse('!!foo');
    }

    public function testComplexMappingThrowsParseException()
    {
        $yaml = <<<YAML
            ? "1"
            :
              name: végétalien
            YAML;

        $this->expectException(ParseException::class);
        $this->expectExceptionMessage('Complex mappings are not supported at line 1 (near "? "1"").');

        $this->parser->parse($yaml);
    }

    public function testComplexMappingNestedInMappingThrowsParseException()
    {
        $yaml = <<<YAML
            diet:
              ? "1"
              :
                name: végétalien
            YAML;

        $this->expectException(ParseException::class);
        $this->expectExceptionMessage('Complex mappings are not supported at line 2 (near "? "1"").');

        $this->parser->parse($yaml);
    }

    public function testComplexMappingNestedInSequenceThrowsParseException()
    {
        $yaml = <<<YAML
            - ? "1"
              :
                name: végétalien
            YAML;

        $this->expectException(ParseException::class);
        $this->expectExceptionMessage('Complex mappings are not supported at line 1 (near "- ? "1"").');

        $this->parser->parse($yaml);
    }

    public function testParsingIniThrowsException()
    {
        $ini = <<<INI
            [parameters]
              foo = bar
              bar = %foo%
            INI;

        $this->expectException(ParseException::class);
        $this->expectExceptionMessage('Unable to parse at line 2 (near "  foo = bar").');

        $this->parser->parse($ini);
    }

    private static function loadTestsFromFixtureFiles($testsFile)
    {
        $parser = new Parser();

        $tests = [];
        $files = $parser->parseFile(__DIR__.'/Fixtures/'.$testsFile);
        foreach ($files as $file) {
            $yamls = file_get_contents(__DIR__.'/Fixtures/'.$file.'.yml');

            // split YAMLs documents
            foreach (preg_split('/^---( %YAML\:1\.0)?/m', $yamls) as $yaml) {
                if (!$yaml) {
                    continue;
                }

                $test = $parser->parse($yaml);
                if (isset($test['todo']) && $test['todo']) {
                    // TODO
                } else {
                    eval('$expected = '.trim($test['php']).';');

                    $tests[] = [var_export($expected, true), $test['yaml'], $test['test']];
                }
            }
        }

        return $tests;
    }

    public function testCanParseVeryLongValue()
    {
        $longStringWithSpaces = str_repeat('xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx ', 20000);
        $trickyVal = ['x' => $longStringWithSpaces];

        $yamlString = Yaml::dump($trickyVal);
        $arrayFromYaml = $this->parser->parse($yamlString);

        $this->assertSame($trickyVal, $arrayFromYaml);
    }

    public function testParserCleansUpReferencesBetweenRuns()
    {
        $yaml = <<<YAML
            foo: &foo
                baz: foobar
            bar:
                <<: *foo
            YAML;
        $this->parser->parse($yaml);

        $yaml = <<<YAML
            bar:
                <<: *foo
            YAML;

        $this->expectException(ParseException::class);
        $this->expectExceptionMessage('Reference "foo" does not exist at line 2');

        $this->parser->parse($yaml);
    }

    public function testPhpConstantTagMappingKey()
    {
        $yaml = <<<YAML
            transitions:
                !php/const 'Symfony\Component\Yaml\Tests\B::FOO':
                    from:
                        - !php/const 'Symfony\Component\Yaml\Tests\B::BAR'
                    to: !php/const 'Symfony\Component\Yaml\Tests\B::BAZ'
            YAML;
        $expected = [
            'transitions' => [
                'foo' => [
                    'from' => [
                        'bar',
                    ],
                    'to' => 'baz',
                ],
            ],
        ];

        $this->assertSame($expected, $this->parser->parse($yaml, Yaml::PARSE_CONSTANT));
    }

    public function testWrongPhpConstantSyntax()
    {
        $this->expectException(ParseException::class);
        $this->expectExceptionMessage('Missing value for tag "php/const:App\Kernel::SEMART_VERSION" at line 1 (near "!php/const:App\Kernel::SEMART_VERSION").');

        $this->parser->parse('!php/const:App\Kernel::SEMART_VERSION', Yaml::PARSE_CUSTOM_TAGS | Yaml::PARSE_CONSTANT);
    }

    public function testPhpConstantTagMappingAsScalarKey()
    {
        $yaml = <<<YAML
            map1:
              - foo: 'value_0'
                !php/const 'Symfony\Component\Yaml\Tests\B::BAR': 'value_1'
            map2:
              - !php/const 'Symfony\Component\Yaml\Tests\B::FOO': 'value_0'
                bar: 'value_1'
            YAML;
        $this->assertSame([
            'map1' => [['foo' => 'value_0', 'bar' => 'value_1']],
            'map2' => [['foo' => 'value_0', 'bar' => 'value_1']],
        ], $this->parser->parse($yaml, Yaml::PARSE_CONSTANT));
    }

    public function testTagMappingAsScalarKey()
    {
        $yaml = <<<YAML
            map1:
              - !!str 0: 'value_0'
                !!str 1: 'value_1'
            YAML;
        $this->assertSame([
            'map1' => [['0' => 'value_0', '1' => 'value_1']],
        ], $this->parser->parse($yaml));
    }

    public function testMergeKeysWhenMappingsAreParsedAsObjects()
    {
        $yaml = <<<YAML
            foo: &FOO
                bar: 1
            bar: &BAR
                baz: 2
                <<: *FOO
            baz:
                baz_foo: 3
                <<:
                    baz_bar: 4
            foobar:
                bar: ~
                <<: [*FOO, *BAR]
            YAML;
        $expected = (object) [
            'foo' => (object) [
                'bar' => 1,
            ],
            'bar' => (object) [
                'baz' => 2,
                'bar' => 1,
            ],
            'baz' => (object) [
                'baz_foo' => 3,
                'baz_bar' => 4,
            ],
            'foobar' => (object) [
                'bar' => null,
                'baz' => 2,
            ],
        ];

        $this->assertSameData($expected, $this->parser->parse($yaml, Yaml::PARSE_OBJECT_FOR_MAP));
    }

    public function testFilenamesAreParsedAsStringsWithoutFlag()
    {
        $file = __DIR__.'/Fixtures/index.yml';

        $this->assertSame($file, $this->parser->parse($file));
    }

    public function testParseFile()
    {
        $this->assertIsArray($this->parser->parseFile(__DIR__.'/Fixtures/index.yml'));
    }

    public function testParsingNonExistentFilesThrowsException()
    {
        $this->expectException(ParseException::class);
        $this->expectExceptionMessageMatches('#^File ".+/Fixtures/nonexistent.yml" does not exist\.$#');
        $this->parser->parseFile(__DIR__.'/Fixtures/nonexistent.yml');
    }

    public function testParsingNotReadableFilesThrowsException()
    {
        if ('\\' === \DIRECTORY_SEPARATOR) {
            $this->markTestSkipped('chmod is not supported on Windows');
        }

        if (!getenv('USER') || 'root' === getenv('USER')) {
            $this->markTestSkipped('This test will fail if run under superuser');
        }

        $file = __DIR__.'/Fixtures/not_readable.yml';
        chmod($file, 0o200);

        $this->expectException(ParseException::class);
        $this->expectExceptionMessageMatches('#^File ".+/Fixtures/not_readable.yml" cannot be read\.$#');

        $this->parser->parseFile($file);
    }

    public function testParseReferencesOnMergeKeys()
    {
        $yaml = <<<YAML
            mergekeyrefdef:
                a: foo
                <<: &quux
                    b: bar
                    c: baz
            mergekeyderef:
                d: quux
                <<: *quux
            YAML;
        $expected = [
            'mergekeyrefdef' => [
                'a' => 'foo',
                'b' => 'bar',
                'c' => 'baz',
            ],
            'mergekeyderef' => [
                'd' => 'quux',
                'b' => 'bar',
                'c' => 'baz',
            ],
        ];

        $this->assertSame($expected, $this->parser->parse($yaml));
    }

    public function testParseReferencesOnMergeKeysWithMappingsParsedAsObjects()
    {
        $yaml = <<<YAML
            mergekeyrefdef:
                a: foo
                <<: &quux
                    b: bar
                    c: baz
            mergekeyderef:
                d: quux
                <<: *quux
            YAML;
        $expected = (object) [
            'mergekeyrefdef' => (object) [
                'a' => 'foo',
                'b' => 'bar',
                'c' => 'baz',
            ],
            'mergekeyderef' => (object) [
                'd' => 'quux',
                'b' => 'bar',
                'c' => 'baz',
            ],
        ];

        $this->assertSameData($expected, $this->parser->parse($yaml, Yaml::PARSE_OBJECT_FOR_MAP));
    }

    public function testEvalRefException()
    {
        $yaml = <<<EOE
            foo: { &foo { a: Steve, <<: *foo} }
            EOE;

        $this->expectException(ParseException::class);
        $this->expectExceptionMessage('Reference "foo" does not exist');

        $this->parser->parse($yaml);
    }

    #[DataProvider('circularReferenceProvider')]
    public function testDetectCircularReferences($yaml)
    {
        $this->expectException(ParseException::class);
        $this->expectExceptionMessage('Circular reference [foo, bar, foo] detected');
        $this->parser->parse($yaml, Yaml::PARSE_CUSTOM_TAGS);
    }

    public static function circularReferenceProvider()
    {
        $tests = [];

        $yaml = <<<YAML
            foo:
                - &foo
                  - &bar
                    bar: foobar
                    baz: *foo
            YAML;
        $tests['sequence'] = [$yaml];

        $yaml = <<<YAML
            foo: &foo
                bar: &bar
                    foobar: baz
                    baz: *foo
            YAML;
        $tests['mapping'] = [$yaml];

        $yaml = <<<YAML
            foo: &foo
                bar: &bar
                    foobar: baz
                    <<: *foo
            YAML;
        $tests['mapping with merge key'] = [$yaml];

        return $tests;
    }

    public function testBlockScalarArray()
    {
        $yaml = <<<'YAML'
            anyOf:
              - $ref: >-
                  #/string/bar
            anyOfMultiline:
              - $ref: >-
                  #/string/bar
                  second line
            nested:
              anyOf:
                - $ref: >-
                    #/string/bar
            YAML;
        $expected = [
            'anyOf' => [
                0 => [
                    '$ref' => '#/string/bar',
                ],
            ],
            'anyOfMultiline' => [
                0 => [
                    '$ref' => '#/string/bar second line',
                ],
            ],
            'nested' => [
                'anyOf' => [
                    0 => [
                        '$ref' => '#/string/bar',
                    ],
                ],
            ],
        ];

        $this->assertSame($expected, $this->parser->parse($yaml));
    }

    #[DataProvider('indentedMappingData')]
    public function testParseIndentedMappings($yaml, $expected)
    {
        $this->assertSame($expected, $this->parser->parse($yaml));
    }

    public static function indentedMappingData()
    {
        $tests = [];

        $yaml = <<<YAML
            foo:
              - bar: "foobar"
                # A comment
                baz: "foobaz"
            YAML;
        $expected = [
            'foo' => [
                [
                    'bar' => 'foobar',
                    'baz' => 'foobaz',
                ],
            ],
        ];
        $tests['comment line is first line in indented block'] = [$yaml, $expected];

        $yaml = <<<YAML
            foo:
                - bar:
                    # comment
                    baz: [1, 2, 3]
            YAML;
        $expected = [
            'foo' => [
                [
                    'bar' => [
                        'baz' => [1, 2, 3],
                    ],
                ],
            ],
        ];
        $tests['mapping value on new line starting with a comment line'] = [$yaml, $expected];

        $yaml = <<<YAML
            foo:
              -
                bar: foobar
            YAML;
        $expected = [
            'foo' => [
                [
                    'bar' => 'foobar',
                ],
            ],
        ];
        $tests['mapping in sequence starting on a new line'] = [$yaml, $expected];

        $yaml = <<<YAML
            foo:

                bar: baz
            YAML;
        $expected = [
            'foo' => [
                'bar' => 'baz',
            ],
        ];
        $tests['blank line at the beginning of an indented mapping value'] = [$yaml, $expected];

        return $tests;
    }

    public function testMultiLineComment()
    {
        $yaml = <<<YAML
            parameters:
                abc

            # Comment
            YAML;

        $this->assertSame(['parameters' => 'abc'], $this->parser->parse($yaml));
    }

    public function testParseValueWithModifiers()
    {
        $yaml = <<<YAML
            parameters:
                abc: |+5 # plus five spaces indent
                     one
                     two
                     three
                     four
                     five
            YAML;
        $this->assertSame(
            [
                'parameters' => [
                    'abc' => implode("\n", ['one', 'two', 'three', 'four', 'five']),
                ],
            ],
            $this->parser->parse($yaml)
        );
    }

    public function testParseValueWithNegativeModifiers()
    {
        $yaml = <<<YAML
            parameters:
                abc: |-3 # minus
                   one
                   two
                   three
                   four
                   five
            YAML;
        $this->assertSame(
            [
                'parameters' => [
                    'abc' => implode("\n", ['one', 'two', 'three', 'four', 'five']),
                ],
            ],
            $this->parser->parse($yaml)
        );
    }

    public function testThrowExceptionIfInvalidAdditionalClosingTagOccurs()
    {
        $yaml = '{
            "object": {
                    "array": [
                        "a",
                        "b",
                        "c"
                    ]
                ],
            }
        }';

        $this->expectException(ParseException::class);
        $this->expectExceptionMessage('Malformed unquoted YAML string at line 8 (near "                ],").');

        $this->parser->parse($yaml);
    }

    public function testWhitespaceAtEndOfLine()
    {
        $yaml = "\nfoo:\n    arguments: [ '@bar' ]  \n";
        $this->assertSame(
            [
                'foo' => [
                    'arguments' => ['@bar'],
                ],
            ],
            $this->parser->parse($yaml)
        );

        $yaml = "\nfoo:\n    bar: {} \n";
        $this->assertSame(
            [
                'foo' => [
                    'bar' => [],
                ],
            ],
            $this->parser->parse($yaml)
        );

        $this->assertSame(
            [
                'foo' => 'bar',
                'foobar' => 'baz',
            ],
            $this->parser->parse("foo: 'bar' \nfoobar: baz")
        );
    }

    /**
     * This is a regression test for a bug where a YAML block with a nested multiline string using | was parsed without
     * a trailing \n when a shorter YAML document was parsed before.
     *
     * When a shorter document was parsed before, the nested string did not have a \n at the end of the string, because
     * the Parser thought it was the end of the file, even though it is not.
     */
    public function testParsingMultipleDocuments()
    {
        $shortDocument = 'foo: bar';
        $longDocument = <<<YAML
            a:
                b: |
                    row
                    row2
            c: d
            YAML;

        // The first parsing set and fixed the totalNumberOfLines in the Parser before, so parsing the short document here
        // to reproduce the issue. If the issue would not have been fixed, the next assertion will fail
        $this->parser->parse($shortDocument);

        // After the total number of lines has been reset the result will be the same as if a new parser was used
        // (before, there was no \n after row2)
        $this->assertSame(['a' => ['b' => "row\nrow2\n"], 'c' => 'd'], $this->parser->parse($longDocument));
    }

    public function testParseIdeographicSpaces()
    {
        $expected = <<<YAML
            unquoted: \u{3000}
            quoted: '\u{3000}'
            within_string: 'a　b'
            regular_space: 'a b'
            YAML;
        $this->assertSame([
            'unquoted' => '　',
            'quoted' => '　',
            'within_string' => 'a　b',
            'regular_space' => 'a b',
        ], $this->parser->parse($expected));
    }

    public function testSkipBlankLines()
    {
        $this->assertSame(['foo' => [null]], (new Parser())->parse("foo:\n-\n\n"));
    }

    private function assertSameData($expected, $actual)
    {
        $this->assertEquals($expected, $actual);
        $this->assertSame(
            var_export($expected, true),
            var_export($actual, true)
        );
    }
}

class B
{
    public $b = 'foo';

    public const FOO = 'foo';
    public const BAR = 'bar';
    public const BAZ = 'baz';
}
